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KMID : 0604520070330030197
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Journal of the Society of Cosmetic Scientists of Korea
2007 Volume.33 No. 3 p.197 ~ p.201
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A Study on the Accelerated Life Test for the Estimation of Licorice Durability in Cosmetics
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Lee So-Mi
Joo Kyeong-Mi
Park Jeong-Eun
Jung Hye-Jin
Chang Ih-Seop
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Abstract
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Oil soluble licorice extract(licorice extract) is an officially approved cosmetic component as a whitening ingredient in Korea. The durability of licorice, during which the whitening effect can be maintained in optimum condition, must be accurately defined. Since the cosmetics durability under real condition is relatively longer than its development time. It is needed to predict the real durability interval from the experimental measurement under simulated operating conditions. We analyzed the relationship between the licorice lifetime and the high temperature condition by using Arrhenius equation. We have established the constant stress test with temperature of , , and condition, within which no formulation change of licorice products is expected for the accelerated stress test. In this paper, the lifetime of licorice in cosmetics was defined as time period for its 10% contents reduction. We observed that the lifetime of licorice is 580 h at , 319 h at and 166 h at . Using the above experimental data, we obtained the equation for the relationship between the licorice lifetime and temperature as follows; log(lifetime)=-35.0243 + 1.15322(11604.83/temperature). From this equation, the lifetime of licorice at can be estimated as 26 months. The estimated result was verified by measuring full lifetime of licorice. In fact, there was no significant difference between the estimated lifetime and real measurement within 95 % significance level. This study can be applied to other useful cosmetic components for the fast estimation of the exact durability.
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KEYWORD
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cosmetics durability, accelerated life test, licorice, Arrhenius equation, whitening
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